linux-kernel - [PATCH v2 2/4] KVM: x86: Advertise SRSO_USER_KERNEL

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Message-ID: <20241202120416.6054-3-bp@kernel.org>
Date: Mon,  2 Dec 2024 13:04:14 +0100
From: Borislav Petkov <bp@...nel.org>
To: Sean Christopherson <seanjc@...gle.com>,
	X86 ML <x86@...nel.org>
Cc: Paolo Bonzini <pbonzini@...hat.com>,
	Josh Poimboeuf <jpoimboe@...hat.com>,
	Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
	KVM <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Borislav Petkov (AMD)" <bp@...en8.de>
Subject: [PATCH v2 2/4] KVM: x86: Advertise SRSO_USER_KERNEL_NO to userspace

From: "Borislav Petkov (AMD)" <bp@...en8.de>

SRSO_USER_KERNEL_NO denotes whether the CPU is affected by SRSO across
user/kernel boundaries. Advertise it to guest userspace.

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
---
 arch/x86/kvm/cpuid.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 097bdc022d0f..7cf5fa77e399 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -800,7 +800,7 @@ void kvm_set_cpu_caps(void)
 	kvm_cpu_cap_mask(CPUID_8000_0021_EAX,
 		F(NO_NESTED_DATA_BP) | F(LFENCE_RDTSC) | 0 /* SmmPgCfgLock */ |
 		F(NULL_SEL_CLR_BASE) | F(AUTOIBRS) | 0 /* PrefetchCtlMsr */ |
-		F(WRMSR_XX_BASE_NS)
+		F(WRMSR_XX_BASE_NS) | F(SRSO_USER_KERNEL_NO)
 	);
 
 	kvm_cpu_cap_check_and_set(X86_FEATURE_SBPB);
-- 
2.43.0